Cooling device for internal-combustion engines



1,422,565.. v Patented. July 11, 1922.

C. GRUNWALD.

COOLING DEVICE FOR.INTERNAL COMBUSTION ENGINES.

" APPLICATION mwuov. 9, 1921.

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CAR-L GRUNXH ALD, 0F ESSEN-BB-EDENEY, GERMANY, ASSIGNOB T0 FRIED. KRUP]?AKTIENGESELLSCHAFT GEE-IVIANIAVJERFT. OF KIEL-GAARDEN, GERMANY.

COOLING DEVICE FOE INTERNAL COMBUSTION ENGINES.

messes,

Application filed November 9, 1921.

T 0 all whom it may concern:

Be it known that I, CARL GRUNwALn, residing at Essen-Bredeney, Germany,a citizen of the German Republic, have invented a certain new and usefulImprovement in Cooling Devices for Internal-Combustion Engines, of whichthe following is a specification. I

This invention relates to cooling devices for internal combustionengines and in particular to those cooling devices in which, in order toprotect the portions of the walls of the combustion chamber which aremost jeopardized by unadmissibly great fluctuations in temperature,exchangeable watercooled chambers are placed in front of these wallportions, in particular at the points where the inlet openings for thevalve cages are situated, said valve cages passing freely through saidcooling chambers so that the latter are not hindered by the valve cagesto freely expand.

Now the object of the present invention is to hold these water-cooledchambers themselves free from strains as far as possible.

This object is attained by so constructing these freely movable andexpansible chambers that the walls, remote from the combustion chamber,of these cooling chambers can likewise be struck by the hot combustiongases.

An embodiment of the subject-matter of the invention is illustrated inthe accompanying drawing by way of example. the drawing showing, invertical section, the questioned portion of the working eylin der of avertical internal combustion engine having the valves arranged in thewall of the cylinder.

A denotes t -e double-walled working cylinder, E the cylinder cover, Cthe working piston and D a scavenging valve arranged in the cylinderwall.

The apertures through which the several valves passonly one valve Dbeing shown in the drawingare surrounded by cooling chambers which canbe easily exchanged. As shown in the drawing, these chambers are, forthe sake of simplicity, united into one closed cooling ring E which isfitted with a hollow, water-cooled bottom protecting the cylinder coverand stiffened by ribs. The wall portions, facing the combustion chamber,of the cooling chamber E are Specification of Letters Patent.

Serial No. 514,045.

made very thin in order to facilitate, as far as possible, the carryingaway of the heat and to obviate great differences in temperature andstrains in these wall portions.

The scavenging valve D passing through the cylinder wall penetrates thecooling chamber E but, in order to avoid strains in said chamber and tonot injure the free movability of the latter, the packing of the valve Dis not placed at this chamber but at the cylinder wall. The supply tothe chamber E and the outlet therefrom, of the cooling water takes placepreferably through freely movable pipes F. F which are packedby stuflingboxes or piston rings on the cylinder cover B and do not, therefore,injure the freedom of movability of the cooling chamber E.

In order to prevent that the wall portions of the cooling chamber,facing the combustion chamber and the cover or the cylinder wall may beheated up to different height when the engine is running, and strainswill consequently arise in the chamber wall, care is taken according tothe present invention that the portions of the chamber E remote from thecombustion chamber, are sufficiently heated likewise.

T 0 this end the wall, of the cooling chamber, adjacent to the cylinderwall, and the cylinder cover is so formed at the greater part of itsbearing surface that hollow spaces a are produced in which the hotcombustion gases enter, the differentheating of the wall portions of thecooling chamber thus being compensated for. The entrance of the hotgases in the hollow spaces 6 is enabled by the cooling chamber having asufficiently large clearance on all sides, particularly on itsperiphery, a condition required also with regard to the necessaryfreedom of movability and expansion of the chamber E.

In order to facilitate the entrance of the combustion gases in thehollow spaces 6 these spaces are preferably connected to each other andto the combustion chamber by means of grooves provided in the outerwalls of the chamber E, see the grooves 6 shown in the drawing.

Claims.

1. A cooling device for internal combustion engines having a cylindercover over its combustion chamber, said device comprising an independenthollow member at the combustion end of the cylinder, said member havingapertures for receiving the valve gages and spaces for cooling fluid,surrounding said valve apertures, means for exposing the walls of saidhollow member, remote from said combustion chamber, to the com bustiongases of the engine. I

2. A cooling device for internal combustion engines having a cylindercover over: its combustion chamber, said device comprising anexchangeable hollow member at the combustion end of vthe cylinder, saidmember having apertures for receiving the valve cages and spaces forcooling fluid, surrounding said valve apertures, recesses between theouter surface of the walls, of said hollow member, remote from saidcombustion chamber, and the adjacent parts of the cylinder and thecylinder cover, and connecting means between said recesses and betweensaid combustion chamber and said recesses.

3. A cooling device for internal combustion engines having a cylindercover over its combustion chamber, said device comprising a removablehollow member at the combustion end of the cylinder, said member havingaperturesfor receiving the valve cages and spaces for cooling fluid,surrounding said valve apertures, recesses in the outer surface of thewalls, of said hollow member, remote from said combustion chamber, andconnecting means between said recesses and between said combustionchamber and said recesses.

4. A cooling device for internal combustion engines having a cylindercover over its combustion chamber, said device comprising anexchangeable hollow member at the combustion end of the cylinder, saidmember having apertures for receiving the valve cages and spaces forcooling fluid, surrounding said valve apertures, recesses in the outersurface of the walls, of said hollow member, remote from said combustionchamber and grooves in the wall portions adjacent said recesses, saidgrooves connectingv said recesses with each other and with thecombustion chamber. x

The foregoing specification signed at Essen, Germany, this eighteenthday oi October, 1921.

CARL GRUNWALD,

